Leon Chuah's lectures are always entertaining. If one is already familiar with his work, or well-versed in electrical engineering, it provides a way to better understand NKS. But it can be challenging to understand. It switches between some trivial stuff to some fairly deep ideas.

I like how he finds the 1200 page book to be more of a starting point, how he wanted to see more details, and ended up writing six books about it himself. I can't really say I understand much of it, but a few years ago we had a summer school student Mohamed Al-Emam whose project was to clarify Leon Chuah's Complexity Index for the elementary cellular automaton. He ended up writing a paper for Complex Systems with Vitaliy Kaurov, who was his advisor.